CN102152356B - Method for preparing densified woods through silica sol - Google Patents
Method for preparing densified woods through silica sol Download PDFInfo
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- CN102152356B CN102152356B CN201110070132.8A CN201110070132A CN102152356B CN 102152356 B CN102152356 B CN 102152356B CN 201110070132 A CN201110070132 A CN 201110070132A CN 102152356 B CN102152356 B CN 102152356B
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Abstract
The invention relates to a method for preparing densified woods through silica sol, in particular to a preparing technology using the silica sol to dip woods. The method comprises the steps as follows: raw materials of the silica sol are selected; then the silica sol is adjusted and prepared, and is reinforced by dipping; first vacuumizing is implemented on a dipping processing tank; then silica sol dipping processing liquid is added into the dipping processing tank, and pressing treatment is implemented; the pressure implemented is 0.8-1.5MPa; then secondary vacuumizing is implemented, and finally the woods through dipping processing are taken out; then nourishing and graded drying are implemented; and finally the reinforced and modified woods are taken out. As the silica sol is cheap and has extremely high stability, the cost of the wood products is reduced; moreover, as the particle diameter of silicon dioxide gel particles in the silica sol is smaller, and the performances of composite woods prepared through the woods are uniform, the mechanical properties of cell walls of the woods are obviously improved; and the strength and the rigidity of the wood products are greatly improved.
Description
Technical field
The present invention relates to a kind of method of preparing reinforced timber with Ludox, especially adopt the technology of preparing of Ludox impregnated timber.
Background technology
Chinoiserie and the Floor Industry output value occupy the first in the world at present, and high-grade furniture and Floor Industry are mainly to take solid wood as raw material, and these raw materials mostly are the timber with high strength and good dimensional stability.Along with people increase day by day to the demand of solid wood, and can reduce gradually for the high-intensity wood consuming.In recent years, the timber resources of China's supply is mainly artificial forest wood, and the material of these timber is poor, and intensity is low, and intensity difference is larger, is difficult to directly as solid wood processing, use.For this reason, often adopt in recent years the method for impregnation process to improve wood quality, improve its intensity, hardness and shrink-resistant energy.
Impregnation process, refers to maceration extract is pressed into timber inside, then by heating, treatment fluid is solidified and is deposited on the process in timber.As Chinese patent ZL200810013225.5 " process of modifying synthetic resin impregnated wood ", Chinese patent ZL201010214843.3 " process of modifying synthetic resin impregnated wood " and US Patent No. D4031276 " resin impregnating is prepared reinforced timber " (Preparation of densified wood impregnated with phenolic resins).
The impregnation process liquid of above method is the synthetic resin (phenolic resins) of synthetic resin or modification.After impregnation process and dry solidification, synthetic resin is most of to be deposited and is filled in the lumen of timber, only has in the cell membrane that enters timber of seldom measuring.And timber is a kind of cellular, level shape, anisotropic heterogeneous body natural high molecular composite material, the cell membrane that its ultra microstructure is comprised of the level of different-thickness, the performance of this cell membrane is only the principal element that determines wood performance.Therefore, to be filled in the processing method in lumen be limited to the improvement of strength of wood and dimensional stability to synthetic resin physics.In addition, because the aperture diameter on wood cell wall is 1～50 nanometer, the synthetic resin of impregnation process seldom can enter in the cell membrane parietal layer of timber, reaches the whole effect infiltrating of whole timber, easily causes the problems such as properties of product are inhomogeneous.Moreover, the intensity and the hardness that enter the synthetic resin itself in wood cell chamber are respectively 3.1GPa and 0.1GPa, far below intensity and the hardness of unseasoned timber cell membrane, so, even if a small amount of synthetic resin has entered in wood cell wall, also not obvious to the effect of strength of wood and hardness.
Summary of the invention
The object of this invention is to provide a kind of method of preparing reinforced timber with Ludox, mainly as impregnation process liquid, to replace conventional synthetic resin or the synthetic resin of modification (phenolic resins) with Ludox, and flood to strengthen and process, make a large amount of Ludox be deposited on the cell membrane parietal layer of timber.
The object of the present invention is achieved like this:
A method of preparing reinforced timber with Ludox, its step is:
1) choosing of raw materials of silica sol: choosing Ludox pH (hydrogen ionexponent) value is 8～11, and density is 1.15～1.35g/cm
3, dioxide-containing silica is 10%～35%, and the particle diameter of silica concentrates on the alkaline silica sol between 5～40 nanometers;
2) Ludox allotment: Ludox is allocated with hydrochloric acid, Ludox pH value is adjusted to 6.5～7.5, obtain Ludox impregnation process liquid;
3) dipping strengthens: the timber that is 8%～30% by moisture content is put into impregnation process tank, to impregnation process tank, vacuumize for the first time 10～30 minutes, vacuum is-0.080 MPa～-0.095 MPa, then Implanted Silicon sol impregnation treatment fluid, the processing of exerting pressure, exerting pressure is 0.8 MPa～1.5 MPa, keeps 30～60 minutes, then pressure relief, turns back to the Ludox treatment fluid in pressure immersion can in solution storage tank; Carry out application of vacuum for the second time, vacuum is-0.080 MPa～-0.095 MPa again, and the processing time is 5～20 minutes; Finally take out the timber through impregnation process;
4) health: the timber after above-mentioned impregnation process is put under room temperature condition and is stacked more than 24 hours, and interlayer is placed wooden parting bead;
5) classification is dry: the timber after health is put into baking oven, between this timber, place parting bead; First at the temperature of 30 ℃, forced convertion is dried 3～6 hours, then is warming up to 80 ℃, and dry 1～6 hour of forced convertion, is then warming up to 100～105 ℃, and strengthening improved wood is finally taken out in dry 3～6 hours of forced convertion.
Choosing of described raw materials of silica sol: select commercially available alkaline silica sol, the pH value of this Ludox is 8, and density is 1.21g/cm
3, dioxide-containing silica is 25%, the particle diameter of silica dioxide granule concentrates between 8～20nm.
Described Ludox allotment: Ludox pH value is 7.22.
Described dipping strengthens to be processed: the Cunninghamia lanceolata timber that is 15% by moisture content is put into impregnation process tank, to impregnation process tank, vacuumizes 10 minutes, and vacuum is-0.095 MPa.
Described classification is dry: the forced convertion at the temperature of 30 ℃ of the timber after health is dried to 5 hours, then is warming up to 80 ℃, dry 4 hours of forced convertion, is then warming up to 103 ℃, dry 5 hours of forced convertion.
Object beneficial effect of the present invention is: because Ludox is cheap, and stability is high, Wood products cost, again, in Ludox, the particle diameter of silica particle is less, and it is even to enter composite wood performance prepared by timber, and the mechanical property of wood cell wall is obviously improved, and the intensity of Wood products and hardness are greatly improved.
The specific embodiment
Below in conjunction with exemplary embodiments, the invention will be further described.
Ludox of the present invention is prepared the method for reinforced timber, and its step is as follows:
1) choosing of raw materials of silica sol: select commercially available alkaline silica sol, the pH value of this Ludox is about 8, and density is about 1.21g/cm
3, dioxide-containing silica is about 25%, and the particle diameter of silica dioxide granule concentrates between 8～20nm, and particle diameter is evenly distributed.Then, by this Ludox strainer filtering, to remove the possible suspended contamination in commercially available Ludox.Choosing commercially available Ludox pH is 8～11, and density is 1.15～1.35g/cm
3, silica SiO
2content is at 10%～35%, SiO
2the alkaline silica sol that concentrates between 5～40 nanometers of particle diameter be raw material.
Ludox is that silicon dioxide microparticle is dispersed in the colloidal solution in water.Compare with synthetic resin, Ludox has higher physical and mechanical property, is commonly used for and strengthens inorganic agent and Wear-resistant Treatment agent; Meanwhile, Ludox has larger specific area, and specific area is generally 250～300m
2/ g, has larger adsorptivity, easily by capillarity, infiltrates timber, and forms stable chemical bond with the chemical composition of wood cell wall parietal layer; The particle size range of Ludox is 5～40 nanometers, in dipping process, can pass through the micropore of wood cell wall parietal layer, is deposited on the cell membrane parietal layer of timber.In addition, Ludox is colourless, odorless, transparent colloidal solution, compares with synthetic resin, does not have harmful, the noxious materials such as formaldehyde, and cheap, is easy to obtain.
2) Ludox allotment: at ambient temperature, add hydrochloric acid to filling in the container of Ludox under the stirring of electric blender, obtain the solution that pH value is 7.22.This solution is the maceration extract of preparation strengthening composite wood.
3) dipping strengthens processing: by specification, be 500 millimeters * 80 millimeters * 20 millimeters, moisture content is that 15% Cunninghamia lanceolata timber is put into impregnation process tank, shut tank door, open vavuum pump, when vacuum reaches goal pressure, treatment fluid vacuum is sucked in process tank, to impregnation process tank, vacuumize 10 minutes, vacuum is-0.095 MPa, to extract the air in wood cell chamber out, the easy processed immersion of timber is noted, and reduced treatment fluid when release and recoil out, retain more treatment fluid in timber.
Then close vavuum pump, the processing of exerting pressure, exerting pressure is 1.0 MPas, keeps 40 minutes, and treatment fluid is pressed in timber dearly, timber no longer absorbs treatment fluid.If turned off vavuum pump before timber pickling does not reach capacity, the air left behind in immersion can so is just compressed to the top of immersion can, so when continuing to add Treatment Solution, these gases will be filled in the timber of process tank top and when vacuumizing, be evacuated Liao space, so just make the treatment fluid of this part timber absorption lesser amt, cause the upper and lower inhomogeneous result of timber of same batch processed.
Then pressure relief, turns back to the Treatment Solution in pressure immersion can in solution storage tank; Connect again vavuum pump, carry out application of vacuum for the second time, vacuum is-0.095 MPa, and the processing time is 5 minutes; Finally remove vacuum, open tank door, take out the moist wood after impregnation process.
4) health: the China fir moist wood after impregnation process is put under room temperature condition and is stacked 24 hours, and interlayer is placed wooden parting bead.
5) classification is dry: the timber after health is put into baking oven, place parting bead between timber; First at the temperature of 30 ℃, forced convertion is dried 5 hours; Be warming up to again 80 ℃, dry 4 hours of forced convertion; Then be warming up to 103 ℃, dry 5 hours of forced convertion; Finally stop being dried, open baking oven, take out strengthening improved wood.
The bending strength mean value of the China fir composite wood after the present invention strengthens modification is 87.70MPa, and Deflection Modulus of Elasticity mean value is 12.41GPa, and the hardness of end face, string face and diametric plane has improved respectively 34.62%, 49.15% and 53.45%.
Tool of the present invention has the following advantages:
1. technique of the present invention is simple, with low cost.Because the raw material of the selected impregnation process liquid of the present invention is alkaline silica sol, its advantage is cheap, be easy to obtain, and stability is high, and resting period is about 1 year, uses Ludox greatly to reduce manufacturing cost for raw material.
2. the outward appearance of alkaline silica sol is nattierblue, odorless, nontoxic, and can be evenly, be stably dispersed in water, therefore by the composite wood after intensive treatment, do not change the original wood color of timber and texture; Compare with conventional synthetic resin dipping, do not have free formaldehyde etc. to pollute.
3. in Ludox, the particle diameter of silica particle is less, and is evenly distributed, SiO
2particle diameter concentrate between 5～40 nanometers.Therefore Ludox particulate can enter in the cell membrane parietal layer of timber, and with cell wall substance generation chemical bond, the composite wood performance of preparation is even, and the mechanical property of cell membrane has obtained obvious improvement.
Claims (5)
1. with Ludox, prepare a method for reinforced timber, it is characterized in that, its step is:
1) choosing of raw materials of silica sol: choosing Ludox pH value is 8～11, and density is 1.15～1.35g/cm
3, dioxide-containing silica is 10%～35%, and the particle diameter of silica concentrates on the alkaline silica sol between 5～40 nanometers;
2) Ludox allotment: Ludox is allocated with hydrochloric acid, Ludox pH value is adjusted to 6.5～7.5, obtain Ludox impregnation process liquid;
3) dipping strengthens: the timber that is 8%～30% by moisture content is put into impregnation process tank, to impregnation process tank, vacuumize for the first time 10～30 minutes, vacuum is-0.080 MPa～-0.095 MPa, then Implanted Silicon sol impregnation treatment fluid, the processing of exerting pressure, exerting pressure is 0.8 MPa～1.5 MPa, keeps 30～60 minutes, then pressure relief, turns back to the Ludox treatment fluid in pressure immersion can in solution storage tank; Carry out application of vacuum for the second time, vacuum is-0.080 MPa～-0.095 MPa again, and the processing time is 5～20 minutes; Finally take out the timber through impregnation process;
4) health: the timber after above-mentioned impregnation process is put under room temperature condition and is stacked more than 24 hours, and interlayer is placed wooden parting bead;
5) classification is dry: the timber after health is put into baking oven, between this timber, place parting bead; First at the temperature of 30 ℃, forced convertion is dried 3～6 hours, then is warming up to 80 ℃, and dry 1～6 hour of forced convertion, is then warming up to 100～105 ℃, and strengthening improved wood is finally taken out in dry 3～6 hours of forced convertion.
2. a kind of method of preparing reinforced timber with Ludox according to claim 1, is characterized in that: the choosing of described raw materials of silica sol: select commercially available alkaline silica sol, the pH value of this Ludox is 8, and density is 1.21g/cm
3, dioxide-containing silica is 25%, the particle diameter of silica dioxide granule concentrates between 8～20nm.
3. a kind of method of preparing reinforced timber with Ludox according to claim 1, is characterized in that: described Ludox allotment: Ludox pH value is 7.22.
4. a kind of method of preparing reinforced timber with Ludox according to claim 1, it is characterized in that: described dipping strengthens to be processed: the Cunninghamia lanceolata timber that is 15% by moisture content is put into impregnation process tank, to impregnation process tank, vacuumize 10 minutes, vacuum is-0.095 MPa.
5. a kind of method of preparing reinforced timber with Ludox according to claim 1, it is characterized in that: described classification is dry: the forced convertion at the temperature of 30 ℃ of the timber after health is dried to 5 hours, be warming up to again 80 ℃, dry 4 hours of forced convertion, then be warming up to 103 ℃, dry 5 hours of forced convertion.
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| CN102554991A (en) * | 2012-02-14 | 2012-07-11 | 中国林业科学研究院木材工业研究所 | Method for improving whole hydrophobicity of wood |
| CN103240782B (en) * | 2013-04-25 | 2015-03-18 | 浙江国振家具有限公司 | Nanometer inorganic carbonized wood preparation method, nanometer inorganic carbonized wood products and application of nanometer inorganic carbonized wood |
| CN103240780B (en) * | 2013-05-27 | 2015-12-09 | 中国热带农业科学院橡胶研究所 | Ludox impregnates the method that pretreatment improves carbonized wood performance |
| FR3044577B1 (en) * | 2015-12-07 | 2017-12-22 | Timothee Boitouzet | METHOD FOR PARTIAL DELIGNIFICATION AND FILLING OF A LIGNOCELLULOSIC MATERIAL, AND STRUCTURE OF COMPOSITE MATERIAL OBTAINED BY THIS PROCESS |
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| FR3067275B1 (en) | 2017-06-07 | 2022-08-12 | Timothee Boitouzet | PROCESS FOR PARTIAL DELIGNIFICATION BY SUPERCRITICAL OR SUBCRITICAL ROUTE AND FILLING OF A LIGNO-CELLULOSIC MATERIAL |
| FR3077895B1 (en) | 2018-02-09 | 2020-02-28 | Sas Woodoo | TACTILE DETECTION DEVICE WITH TACTILE INTERFACE IN COMPOSITE MATERIAL |
| CN108943232A (en) * | 2018-05-10 | 2018-12-07 | 宜华生活科技股份有限公司 | Fast growing wood silica solution dipping is modified and method of modifying is combined in superheated steam processing |
| CN109203632A (en) * | 2018-09-04 | 2019-01-15 | 合肥久新不锈钢厨具有限公司 | A kind of preparation method of antibiotic cabinet plate material |
| CN112077967B (en) * | 2020-09-15 | 2021-11-30 | 清华大学 | Wood strengthening treatment equipment and method |
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| CN116810947B (en) * | 2023-08-03 | 2024-01-02 | 阜南县富民工艺品有限公司 | Processing method of reinforced anti-corrosion willow board |
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